/**
 * Created by Dowin on 2017/6/2.
 */
export default function(objA, objB, compare, compareContext) {
	
	var ret = compare ? compare.call(compareContext, objA, objB) : void 0;
	
	if(ret !== void 0) {
		return !!ret;
	}
	
	if(objA === objB) {
		return true;
	}
	
	if(typeof objA !== 'object' || !objA ||
		typeof objB !== 'object' || !objB) {
		return false;
	}
	
	var keysA = Object.keys(objA);
	var keysB = Object.keys(objB);
	
	if(keysA.length !== keysB.length) {
		return false;
	}
	
	var bHasOwnProperty = Object.prototype.hasOwnProperty.bind(objB);
	
	// Test for A's keys different from B.
	for(var idx = 0; idx < keysA.length; idx++) {
		
		var key = keysA[idx];
		
		if(!bHasOwnProperty(key)) {
			return false;
		}
		
		var valueA = objA[key];
		var valueB = objB[key];
		
		ret = compare ? compare.call(compareContext, valueA, valueB, key) : void 0;
		
		if(ret === false ||
			ret === void 0 && valueA !== valueB) {
			return false;
		}
		
	}
	
	return true;
	
};
